Because he was so extreme with his sound, he relied heavily on a locking tremolo, namely a Floyd Rose. This allowed him to dive-bomb his guitar without it going out of tune. However, the mechanics of the Floyd Rose makes it hard to change tunings, especially the popular “Drop-D” tuning. So he invented and patented a device called the “Duna”, allowing for easy alternate tunings on a locking tremolo.
Van Halen’s first record was in 1977, at a time when rock music was not popular at all. Punk and Disco ruled the airwaves, but I would argue that if it wasn’t for Eddie’s style of guitar Van Halen wouldn’t have been a success, (a bad thing), and the hair metal craze of the ’80s would not have happened (debatable). What they basically did was realize that rock and roll is basically the blues combined with swing music.
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